This issue of Surgical Oncology Clinics of North America, guest edited by Dr. Cathy Eng, is devoted to Anal Canal Cancers. Dr. Eng has assembled expert authors to review the following topics: Epidemiology of Anal Canal Cancers; Management of Anal Dysplasia; Diagnosis and Diagnostic Imaging of Anal Canal Cancers; Pathology of Anal Canal Cancers; Treatment of the Primary Tumor in Anal Canal Cancers; Acute and Chronic Toxicities of Radiation Therapy for Anal Canal Cancers; Locally Recurrent Disease Related to Anal Canal Cancers; Surveillance of Anal Canal Cancers; Metastatic Anal Cancer and Novel Agents; Treatment of Oligometastatic Disease; Unusual Anal Cancers: Melanoma and Carcinoid; Patient Perspective and Personal Journey of Treating a "Rare Cancer"; HIV/AIDS, HPV, and Anal Cancer; Pathology of Anal Cancer, and more!